Lifting-jack.



N5. 721,518. y* PATBNTBD FEB. 24,1903.'

L-io; HBNGGI & E, WooDINGs.

LIFTING JACK.

APyLIoATloN FILED APR. 2, reos.

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N0 MODEL.

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LIFTING JACK. 4 APPLICATION FILED APR;- 2,1902. I0 MODEL.

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UNITED f STATES PATENT OFFICE.

IlEWIS O. HENGGI AND'EMANUEL WOODINGS, OF OAKMONT,

' PENNSYLVANIA.

LIFTING-JAC K.

SPECIFICATION forming part of Letters Patent No. 721,518, dated February24, 1903.

'l Application filed April Z, 1902. Serial No. 101 J107. (No model.)

To a/ZZ whom it may concern:

Be it known that we, LEWIS O.j HENGGI and EMANUEL WOODINGS, ot' Oakmont,in the county of Allegheny and State of Pennsylvania, have invented anew and useful Litting-Jack, of which the following is a full, clear,and exactV description, reference being had to the accompanyingdrawings, forming part of this specification, in which- Figure l is aside elevation, `partly broken away, of our` improved jack. Fig. 2 is asectional side elevation of the same, showing the parts in adjustedyposition. Fig. 3 is a detail view on the opposite side to that of Fig.l, showing thepa'wl system; and Fig. 4 is a front elevation of the jack,Apartly broken away.

Our invention relates to that class of jacks wherein the lifting-bar ismoved step by step in either direction by means of a plurality of pawls;and its object is to provide a simple and compact jack in which themovement may be reversed by means of a swinging dog having an adjustablefulcrum.

In the drawings, 2 is a hollow standard or casing, and 3 a toothedlifting-bar movable vertically therein.

4 is the operating-lever, which is pivoted to the standard at 5 andprovided with a pivoted lifting-pawl 6 at its inner end. The other pawl7 is in the form of a U-shaped detent, pivoted to the casing at A9. Alink 10 is also pivoted at the inner end of the operating-lever and isprovided at its upper end with a pin 11, which projects within a curvedslot 12 in a swinging dog 13. The pivot-pin 14 of the dog is carriedwithin a bearing 15, which is adjustable within a slot 16 in the side ofthe casing. The bearing is formed as a projection upon the side of alever 17, which is pivoted within the frame at 18 and is provided at itsupper end Vwith a swinging latch 19, arranged to drop withinlocking-notches 2O of a slot in the side of the casing.

The weighted dog 13 Vis cut away on one side to allow space for thelever 17, and the upper end of this dog is shaped to engage a notch 2lin the upper detent. The liftingpawl 6 is provided with a lateral pin orlug 22, which is engaged by the lower part of the dog during lowering.

When loweringl the lifting-bar step by step, the parts are in theposition shown in Fig. 2, and as the operating-lever is lowered to movethe lifting-pawl up into the next tooth, the pin on the link 10 movesidly within the slot in the dog until the end of the slot 12 is reached.Further movement swings the dog,

whose upper end pushes out the detent 7 as the lifting-pawl engages thetooth. The parts then assume the positionof Fig. 1. As `the lifting-baris'lowered the dog holds the detent out of action, while the pin movesback within the slot in the dog until the liftingbar is lowered, sothatthe point of the next tooth is below the detent. On further lowering thepin engages the lower end of the slot and swings back the dog, allowingthe detent to engage the tooth, and as the dog swings back its lower endstrikes the pin on the lifting-pawl and swings this pawl out, the partsthen assuming the position of Fig. 2.

In moving the lifting-bar upwardly the latch is lifted and the lever 17is swung over and the latch then dropped into the other notch. The dogis thus held out of action, and the pawls act in their normal manner asin ordinary jacks, the detent sliding over the inclined tooth as thelower pawl forces the bar upwardly and then dropping into the nexttooth, after which the pawl is moved down to rengage. f

The advantages of the inventionl result from the use of the swinging dogwith its movable fulcrum and link connections with the lever. By theaddition of this part the jack is made reversible to move the liftingbareither upwardly or downwardly.

Many changes may be made in the form and arrangement of the jack, thepawls, the dog, dac., without departingfrom our invention.

We claim l 1. A jack having a pluralityVVV of pawls engaging a toothedbar, a pivotedfdog arranged to act upon at least one of the pawls duringstep-by-step lowering, said dog having an adjustable fulcrum andmechanism for holding the fuloruin in its adjusted positions;substantially as described.

2. A jack having a toothed bar, two pawls engaging the teeth of saidbar, a swinging dog pivoted to the casing and arranged to engage thepawls during lowering, said dog having an adjustable fulcrum, and a linkconnection between the dog and the actuat-A ing-lever; substantially asdescribed.

3. A jack having a toothed bar, two pawls engaging the teeth of saidbar, a pivoted dog arranged to engage the pawls during lowering, saiddog having an adjustable fuleruln, a latch device arranged to hold thefulcrum in adjusted position, and a link connection between the dog andthe lever; substantially as described.

et. A jack having two pawls engaging a toothed bar, a pivoted dogarranged to engage the pawls during step-by-step lowering, said doghaving an adjustable fulcrum, and

a link pivoted to the operating-lever and having a loose slottedconnection with the dog; substantially as described.

5. A jack having a toothed bar, an operating-lever having a lifting-pawlpivoted at its inner end, a detent-pawl pivoted to the casing, aswinging dog pivoted in the casing and arranged to engage the pawlsduring step-by-step lowering, an adjustable fulcrum for the dog, meansfor holding the fnlcrum in its adjusted position, and a link pivoted tothe lever and having loose slotted connection with the dog;substantially as described.

In testimony whereof we have hereunto 35 set our hands.

LEWIS O. I-IENGGI. EMANUEL VOODINGS.

Witnesses:

Guo. B. BLEMING, L. M. REDMAN.

